PiCorePlayer no access to "Setup Network Disk Mount"

Hi all,

I started new with PCP7 and everything went fine. Only point I get problems is mounting my Synology NAS Music directory. I don't have access to the part "Setup Network Disk Mount" in Tab "LMS".
I can't enable the checkbox nor fill in anything in the following fields ...
Alternativly I tried to do it using ssh but can't create /mnt/share because I can't change to the directory /mnt (linux newbie)

Thanks for any help
Dieter

Attached Images